<?php
/***************************************
** Filename.......: class.smtp.inc
** Project........: SMTP Class
** Version........: 1.00b
** Last Modified..: 30 September 2001
***************************************/

define('SMTP_STATUS_NOT_CONNECTED', 1, TRUE);
define('SMTP_STATUS_CONNECTED', 2, TRUE);

class smtp{

var $connection;
var $recipients;
var $headers;
var $timeout;
var $errors;
var $status;
var $body;
var $from;
var $host;
var $port;
var $helo;
var $auth;
var $user;
var $pass;

/***************************************
** Constructor function. Arguments:
** $params - An assoc array of parameters:
**
** host - The hostname of the smtp server Default: localhost
** port - The port the smtp server runs on Default: 25
** helo - What to send as the HELO command Default: localhost
** (typically the hostname of the
** machine this s cript runs on)
** auth - Whether to use basic authentication Default: FALSE
** user - Username for authentication Default: 
** pass - Password for authentication Default: 
** timeout - The timeout in seconds for the call Default: 5
** to fsockopen()
***************************************/

function smtp($params = array()){

if(!defined('CRLF'))
define('CRLF', "\r\n", TRUE);

$this->timeout = 5;
$this->status = SMTP_STATUS_NOT_CONNECTED;
$this->host = 'localhost';
$this->port = 25;
$this->helo = 'localhost';
$this->auth = FALSE;
$this->user = '';
$this->pass = '';
$this->errors = array();

foreach($params as $key => $value){
$this->$key = $value;
}
}

/***************************************
** Connect function. This will, when called
** statically, create a new smtp object, 
** call the connect function (ie this function)
** and return it. When not called statically,
** it will connect to the server and send
** the HELO command.
***************************************/

function connect($params = array()){

if(!isset($this->status)){
$obj = new smtp($params);
if($obj->connect()){
$obj->status = SMTP_STATUS_CONNECTED;
}

return $obj;

}else{
$this->connection = fsockopen($this->host, $this->port, $errno, $errstr, $this->timeout);
socket_set_timeout($this->connection, 0, 250000);

$greeting = $this->get_data();
if(is_resource($this->connection)){
return $this->auth ? $this->ehlo() : $this->helo();
}else{
$this->errors[] = 'Failed to connect to server: '.$errstr;
return FALSE;
}
}
}

/***************************************
** Function which handles sending the mail.
** Arguments:
** $params - Optional assoc array of parameters.
** Can contain:
** recipients - Indexed array of recipients
** from - The from address. (used in MAIL FROM:),
** this will be the return path
** headers - Indexed array of headers, one header per array entry
** body - The body of the email
** It can also contain any of the parameters from the connect()
** function
***************************************/

function send($params = array()){

foreach($params as $key => $value){
$this->set($key, $value);
}

if($this->is_connected()){

// Do we auth or not? Note the distinction between the auth variable and auth() function
if($this->auth){
if(!$this->auth())
return FALSE;
}

$this->mail($this->from);
if(is_array($this->recipients))
foreach($this->recipients as $value)
$this->rcpt($value);
else
$this->rcpt($this->recipients);

if(!$this->data())
return FALSE;

// Transparency
$headers = str_replace(CRLF.'.', CRLF.'..', trim(implode(CRLF, $this->headers)));
$body = str_replace(CRLF.'.', CRLF.'..', $this->body);
$body = $body[0] == '.' ? '.'.$body : $body;

$this->send_data($headers);
$this->send_data('');
$this->send_data($body);
$this->send_data('.');

return (substr(trim($this->get_data()), 0, 3) === '250');
}else{
$this->errors[] = 'Not connected!';
return FALSE;
}
}

/***************************************
** Function to implement HELO cmd
***************************************/

function helo(){
if(is_resource($this->connection)
AND $this->send_data('HELO '.$this->helo)
AND substr(trim($error = $this->get_data()), 0, 3) === '250' ){

return TRUE;

}else{
$this->errors[] = 'HELO command failed, output: ' . trim(substr(trim($error),3));
return FALSE;
}
}

/***************************************
** Function to implement EHLO cmd
***************************************/

function ehlo(){
if(is_resource($this->connection)
AND $this->send_data('EHLO '.$this->helo)
AND substr(trim($error = $this->get_data()), 0, 3) === '250' ){

return TRUE;

}else{
$this->errors[] = 'EHLO command failed, output: ' . trim(substr(trim($error),3));
return FALSE;
}
}

/***************************************
** Function to implement AUTH cmd
***************************************/

function auth(){
if(is_resource($this->connection)
AND $this->send_data('AUTH LOGIN')
AND substr(trim($error = $this->get_data()), 0, 3) === '334'
AND $this->send_data(base64_encode($this->user)) // Send username
AND substr(trim($error = $this->get_data()),0,3) === '334'
AND $this->send_data(base64_encode($this->pass)) // Send password
AND substr(trim($error = $this->get_data()),0,3) === '235' ){

return TRUE;

}else{
$this->errors[] = 'AUTH command failed: ' . trim(substr(trim($error),3));
return FALSE;
}
}

/***************************************
** Function that handles the MAIL FROM: cmd
***************************************/

function mail($from){

if($this->is_connected()
AND $this->send_data('MAIL FROM:<'.$from.'>')
AND substr(trim($this->get_data()), 0, 2) === '250' ){

return TRUE;

}else
return FALSE;
}

/***************************************
** Function that handles the RCPT TO: cmd
***************************************/

function rcpt($to){

if($this->is_connected()
AND $this->send_data('RCPT TO:<'.$to.'>')
AND substr(trim($error = $this->get_data()), 0, 2) === '25' ){

return TRUE;

}else{
$this->errors[] = trim(substr(trim($error), 3));
return FALSE;
}
}

/***************************************
** Function that sends the DATA cmd
***************************************/

function data(){

if($this->is_connected()
AND $this->send_data('DATA')
AND substr(trim($error = $this->get_data()), 0, 3) === '354' ){

return TRUE;

}else{
$this->errors[] = trim(substr(trim($error), 3));
return FALSE;
}
}

/***************************************
** Function to determine if this object
** is connected to the server or not.
***************************************/

function is_connected(){

return (is_resource($this->connection) AND ($this->status === SMTP_STATUS_CONNECTED));
}

/***************************************
** Function to send a bit of data
***************************************/

function send_data($data){

if(is_resource($this->connection)){
return fwrite($this->connection, $data.CRLF, strlen($data)+2);
}else
return FALSE;
}

/***************************************
** Function to get data.
***************************************/

function &get_data(){

$return = '';
$line = '';

if(is_resource($this->connection)){
while(strpos($return, CRLF) === FALSE OR substr($line,3,1) !== ' '){
$line = fgets($this->connection, 512);
$return .= $line;
}
return $return;

}else
return FALSE;
}

/***************************************
** Sets a variable
***************************************/

function set($var, $value){

$this->$var = $value;
return TRUE;
}

} // End of class
?>
